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Kidneys Grown in Petri Dishes Claimed to Be Functional When Transplanted in Animals

 

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Source: Flickr Commons. Credit to: Alpha

This past decade has been an exciting time for regenerative science. Developmental biologists have been striving to discover new methods to grow organs such as hearts, brains, muscles, and even a hamburger patty from stem cells. As of only this September, kidneys grown in Petri dishes have been shown to be functional in animal studies!

Japanese researcher Dr. Shinya Yokote and his team have come across a scientific breakthrough within the stem cell research field in their recent early edition paper published on September 21st, 2015.

The early edition paper claims that transplant of lab-grown kidneys from stem cells are fully functional – in the sense that they can generate and excrete urine – in their animal studies with rats and pigs. Other groups in the past have generated half functioning kidneys that could generate urine when transplanted into animals, but not excrete it – a disorder known as hydronephrosis.

Dr. Yokote’s group managed to overcome hydronephrosis by inventing a new system within the rat’s body for the stem cell-generated kidneys to excrete their waste in to prevent hydronephrosis. They biologically engineered a persistent drainage tube to the kidney and connected it to a temporary bladder which was transplanted along with the kidney. This new system would empty its waste to the animal’s real bladder when it became full. The scientists named this system the “stepwise peristaltic ureter,” (SWPU) and believe that this could be the future of kidney transplantation.

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A picture of the SWPU system that were used to transplant into rats. Source: Yokote, S., Matsunari, H., Iwai, S., Yamanaka, S., Uchikura, A., Fujimoto, E., Matsumoto, K., Nagashima, H., Kobayashi, E., Yokoo, T. (2015). Urine excretion strategy for stem cell-generated embryonic kidneys. PNAS Early Edition September 21, 2015. doi: 10.1073/pnas.1507803112

Although this discovery could impact millions with kidney failures in the future, readers should be warned that this is only an early access article. The researchers have not shown any empirical data to support their claims in their early access article. Those interested should keep a keen eye open for the full paper to be released!

By Justin Yoon

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The future of wound healing

If today you cut your hand accidentally, what would you do? I would put some pressure on the wound and a Band-Aid to stop the bleeding! However, what if you are an military doctor operating on someone who has been shot on the battlefield, and is bleeding profusely on the operating table?

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Surgery, Author: Army Medicine  Source: Flickr Commons

Modern blood clotting agents do exist, but they are slow to action and may pose health risks later on. This is where Vetigel comes into the spotlight! Created by Joe Landolina and his company Suneris, this new invention has the possibility to revolutionize the medical field.

Before we find out what Vetigel does, I will first explain how our body heals that simple paper cut on our hand. It may be surprising to know that the healing mechanisms behind a paper cut and a gunshot wound is strikingly similar. The major difference is the size of the wound, which means your body has less time to self-heal with more blood being lost every second.

Our wounds heal with special mechanisms that involve our cells, and a microscopic mesh that exists between these cells called the extracellular matrix. This matrix is also what holds your cells in place, help cells communicate with each other,  and assist in nutrient transport. When a wound heals, the human body is simply recreating this matrix with the help of other specialized cells from the immune system (Enoch & Leaper, 2005). Unfortunately, I don’t think the human body has the one type fits all kind of extracellular matrix. Instead, our bodies has to slowly recreate this extracellular matrix specifically for the site of injury.

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Extracellular matrix, Author: Alejandro Porto Source: Wikimedia commons

In my opinion, this problem of slow self-regeneration is what Vetigel tries to resolve. Vetigel™ can spontaneously assemble into the same “configuration” of extracellular matrix wherever it’s applied. It speeds up your own body’s ability to heal wounds by removing the need to slowly recreate the extracellular matrix. If you put Vetigel on your skin, the gel will self-assemble into a mesh similar to your skin`s extracellular matrix; if you apply Vetigel™ to your heart, the gel will assemble into a mesh similar to your heart’s extracellular matrix. I was truly amazed at the speed at which traumatic bleeding can be stopped, here is a video demonstrating Vetigel in action (blood warning):YouTube Preview Image

Joe Landolina`s genius is that he  realized certain polymers derived from plant cell wall have self-assembling properties. Therefore, by basing Vetigel on these plant polymers, Vetigel can automatically assemble in a similar fashion as the micro-environment it is applied on. Here’s his TED talk giving a more detailed introduction of his product:

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The future of emergency and military medicine sure looks bright, but FDA approval of this amazing product is still a few years away.  For now, Joe Landolina has started producing Vetigel for veterinary medicine, and maybe one day your beloved dog will be saved because of innovative science!

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Saving man’s best friend! Author: Austin Community College, Source: Flickr Commons

By Yu Chieh (Brian) Cheng